On the typical calendar of a Colorado election year, the Republican and Democratic county assemblies don’t stand out to most voters who are waiting until August primaries, or even November, to express their preferences, The Colorado Independent reports.

In reality, though, those assemblies can be pivotal. And in El Paso County, both major parties will be convening on Saturday, April 10 — Democrats at Palmer High School, Republicans at the University of Colorado at Colorado Springs — to deal with contested races and to choose delegates for the upcoming state conventions.

Here’s a closer look at what to expect.